5.5 The Substitution Rule/1

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Failed to parse (Conversion error. Server ("https://en.wikipedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle {\begin{aligned}&\int {e^{-x}}dx,u=-x\\[2ex]&\int {e^{-x}}dx\\[2ex]\end{aligned}}}